Apex Tool Group Llc - Tools Sp40Nkus 40 Watt Soldering Iron Kit

what temperature does the 40W get up to in degrees F?

I'm new to soldering. I have practiced with the soldering included in the kit, but would like to try repairing sterling silver jewelry. My question: What type of sterling silver soldering should I consider buying?

for electronic work builiding diy amplifier which 25 or 40watt version?

Are any of the included tips ironclad?